Since the 1950s, bats and other wild animals have replaced dogs as the major U.S. source of human deaths from rabies.

If a predator breaks through the wall of the gall housing these aphids, some of the tiny insects will exude a goo that will harden and plaster shut the opening. Unfortunately, the home-repair crews will likely lose their life in the process.

At about 1 meter (39 inches) tall at the hip, the newly identified Suskityrannus hazelae (illustrated) suggests tyrannosaurs gained fearsome traits before they got really big.

In a feat that has shaken up neuroscience, scientists used an artificial fluid to keep cells alive in the brains of pigs that had been slaughtered for pork.